Electromagnetic nucleon form factors from QCD sum rules

Abstract

The electromagnetic form factors of the nucleon, in the space-like region, are determined from three-point function Finite Energy QCD Sum Rules. The QCD calculation is performed to leading order in perturbation theory in the chiral limit, and to leading order in the non-perturbative power corrections. The results for the Dirac form factor, $F_1(q^2)$, are in very good agreement with data for both the proton and the neutron, in the currently accessible experimental region of momentum transfers. This is not the case, though, for the Pauli form factor $F_2(q^2)$, which has a soft $q^2$-dependence proportional to the quark condensate $<0|\bar{q}q|0>$.

Replaced Version. An error has been corrected in the numerical evaluation of the Pauli form factor. This changes the results for F_2(q^2), as well as the conclusions

References in corpus (5)

• How well do we know the electromagnetic form factors of the proton?
• Measurements of GEn/GMn from the ^2H(vec{e},e'vec{n})^1H Reaction to Q^2=1.45 (GeV/c)^2
• Measurement of the Electric Form Factor of the Neutron at Q^2=0.5 and 1.0 (GeV/c)^2
• Implications of the discrepancy between proton form factor measurements
• Improved Light-Cone Sum Rules for the Electromagnetic Form Factors of the Nucleon

Cited by in corpus (6)

• Nucleon Form Factors in QCD
• Light Cone Sum Rules for gamma* N -> Delta Transition Form Factors
• Weak decays of doubly heavy baryons: "decay constants"
• Nucleon Electromagnetic Form Factors in QCD
• Nucleon Form Factors to Next-to-Leading Order with Light-Cone Sum Rules
• Coulomb distortion effects in quasi-elastic (e,e') scattering on heavy nuclei